The hydrothermal synthesis and the chemical-physical characterization of an ammonium-chromium(III)-iron(III) bis(hydrogenphosphate), Cr_0.34Fe_0.66NH₄(HPO₄)₂ [CrFeNP] is reported. It was obtained in aqueous media by reaction between chromium(III) chloride, iron(III) chloride, urea, and orthophosphoric acid. The crystal structure of CrFeNP was determined from single-crystal X-ray diffraction data. It crystallizes in the triclinic system, space group P−1, and exhibits two types of different infinite tunnels along [0 1 0] and [1 0 0] directions, where the ammonium cations are located. Thermal analysis shows that the solid is stable up to ca. 600 K. The activation energy of the thermal decomposition up to 1273 K was computed by isoconversional methods. In addition, the magnetic behaviour of the material was investigated from magnetic susceptibility and magnetization measurements. CrFeNP undergoes two successive magnetic transitions at temperatures $T_C=17.9$ K and $T_t=3.1$ K, which could be related to a ferri- and an antiferromagnetic magnetic phase transitions, respectively.

报道了铬-铬（III）-铁（III）双（磷酸氢根）Cr _0.34 Fe _0.66 NH ₄（HPO ₄）₂ [CrFeNP]的水热合成和化学物理性质。在水性介质中，是通过氯化铬（III），氯化铁（III），尿素和正磷酸之间的反应获得的。CrFeNP的晶体结构由单晶X射线衍射数据确定。它在三斜晶系空间群P -1中结晶，并沿铵离子位于[0 1 0]和[1 0 0]的方向呈现出两种类型的无限隧道。热分析表明，该固体稳定至约200℃。600 K. 通过等转换方法计算了高达1273 K的热分解活化能。此外，还从磁化率和磁化强度测量中研究了材料的磁性能。CrFeNP在温度下经历了两个连续的磁跃迁${Ť}_C=17.9$ K和 ${Ť}_{Ť}=3.1$ K，可能分别与亚铁磁性和反铁磁性磁性相变有关。